/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: mirac
 * Date: 2025-08-19
 * Time: 19:21
 */
public class Solution {
    static class TreeNode {
        int val;
        TreeNode left;
        TreeNode right;

        TreeNode() {
        }

        TreeNode(int val) {
            this.val = val;
        }
    }
    public boolean isSymmetric(TreeNode root) {
        if (root == null) return true;
        return isMirror(root.left,root.right);
    }
    private boolean isMirror(TreeNode t1, TreeNode t2) {
        if (t1 == null && t2 == null) return true;
        if (t1 == null || t2 == null) return false;

        return (t1.val == t2.val)
                && isMirror(t1.left,t2.right)
                && isMirror(t1.right,t2.left);
    }
}


